Was curious if anyone had made a go of tuning Avid BB7 mechanical disc calipers? I note that there appear to be 2 large and one small bolt that would be good candidates for ti replacements but wanted to check WW before disassembling brand new calipers without checking first.

Yes, I have the 2012 BB7 'Road' version. It is a satin silver color where as the off-road BB7 is a dark grey color. Interesting in the recent BikeRumor article about the new Cannodale CX bikes, the SuperX was said to be sporting Avid BB7 'Ultimates' and was curious what that is?

I have the new Super-X disc and from what I have read and found online, the new BB7 Ultimate brakes just have ti hardware. I will be updating my post about the Super-X, which will include more information about the brakes in the new few days.

Avid is soon the release the BB7 Road SL, which I believe will save 50g from your current brakes. It may be worth waiting until they hit the market.

I am awaiting delivery of the bolts I ordered but can tell you that the size of the caliper mounting bolts will depend on whether you mounted the brakes using IS or post mounts as the post mount bolts are longer. For post mount with 160mm rotors, here are the specs of the Ti bolts I ordered (note except for the Torx head rotor bolts, all are Taper Head):

Why not? Is the 100grams save on a light bike more worth than a 100 on a not so light bike?

Id think the rotors would be a good place to shave some weight unless you did that allrdy. Think standard bb7 rotors are a tad more than 100g / piece. Can shave about 30 on that i would guess. so 60 per wheel just on the rotors or thereabouts.

The new sl version is as said claimed at 25g saved per wheel but that was just the caliper i think so additional weightsavings on rotors would put that setup at around 310g per wheel. Still 620 gram brakeset aint that light..

Why not? Is the 100grams save on a light bike more worth than a 100 on a not so light bike?

I mean it doesn't make sense (to me) if you decided to upgrade (actually downgrade) and actually increased the weight of your bike (maybe 500 gr). When I made a calculation of weight difference between my current setup (TRP mag) and disks considering all the stuff that comes with disks (rotors with screws, heavier hubs, heavy brake calipers, much longer cables and cable housing etc.) I realized the weight difference between the lightest disk setup and the lightest cantilever brake setup is huge

Actually only the rotors with screws I have on one of my MTBs weights as the whole trp setup I have I'm running now

Yeah i know what you meant. Just that once decided to go with discs its still nice to shave weight. I was amazed how much weight increase i had on a cross bike i choose to retrofit with discs. Even with carbon rims it never felt light.

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